It's a nonessential word, clause, or sentence added to an already grammatically complete sentence. It's most commonly set off by brackets, but it can also be set off by commas or dashes.
Example:
My mother went to the supermarket and picked up some strawberries (my favorite fruit) earlier today.
Answer:
reliable relationship between two people
Explanation:
Answer:
I think it might be the 2nd one but I am not sure.
Explanation:
